mvebu: uDPU: add sysupgrade support

This patch adds sysupgrade, uboot-env and networking support
for Methode uDPU device.

Device features 4 partitions:

-----------------------------------------
|  boot   | recovery  | rootfs |  misc  |
| (ext4)  |  (ext4)   | (fsf2) | (f2fs) |
_________________________________________

Idea was to use f2fs only but the u-boot currently lacks support
so first 2 partition are ext4 to be u-boot readable, and this was
a reason why custom build and sysupgrade sections were required.

On the sysupgrade, boot and rootfs partitions are updated, firmare
image and user configuration is saved on the misc partition and if
the upgrade was successfull, recovery partition will be updated on
after the reboot from preinit script. If the sysupgrade fails for any
reason, device will fallback to recovery initramfs image.

Signed-off-by: Vladimir Vid <vladimir.vid@sartura.hr>

3 files changed, 206 insertions, 0 deletions

diff --git a/target/linux/mvebu/base-files/lib/preinit/82_uDPU b/target/linux/mvebu/base-files/lib/preinit/82_uDPU
new file mode 100644
index 0000000000..937a0a5f21
--- /dev/null
+++ b/target/linux/mvebu/base-files/lib/preinit/82_uDPU
@@ -0,0 +1,48 @@
+#
+# Copyright (C) 2014-2019 OpenWrt.org
+# Copyright (C) 2016 LEDE-Project.org
+#
+
+preinit_mount_udpu() {
+
+	. /lib/functions.sh
+
+	case $(board_name) in
+	methode,udpu)
+		# Check which device is detected
+		[ -b "/dev/mmcblk0" ] && mmcdev="/dev/mmcblk0" || mmcdev="/dev/mmcblk1"
+
+		if [ -b "${mmcdev}p4" ]; then
+			mkdir /misc
+			mount -t f2fs ${mmcdev}p4 /misc
+			[ -f "/misc/sysupgrade.tgz" ] && {
+				echo "- Restoring configuration files -"
+				tar xzf /misc/sysupgrade.tgz -C /
+				rm -f /misc/sysupgrade.tgz
+				sync
+			}
+			[ -f "/misc/firmware/recovery.itb" ] && {
+					echo "- Updating /recovery partition -"
+					mkfs.ext4 -q ${mmcdev}p2 | echo y &> /dev/null
+					mkdir -p /tmp/recovery
+					mount ${mmcdev}p2 /tmp/recovery
+					cp /misc/firmware/recovery.itb /tmp/recovery
+					[ -f "/misc/firmware/boot.scr" ] && \
+						cp /misc/firmware/boot.scr /tmp/recovery
+					sync
+					umount /tmp/recovery
+					rm -rf /tmp/recovery
+
+					# Replace previous backup with the new one
+					[ -d "/misc/firmware_old" ] && rm -rf /misc/firmware_old
+					[ -d "/misc/firmware" ] && mv /misc/firmware /misc/firmware_old
+				}
+		fi
+
+		# Legacy support - if rootfs was booted, instruct u-boot to keep the current root dev
+		[ "$(df | grep /dev/root)" ] && fw_setenv root_ok '2'
+	;;
+	esac
+}
+
+boot_hook_add preinit_main preinit_mount_udpu
diff --git a/target/linux/mvebu/base-files/lib/upgrade/platform.sh b/target/linux/mvebu/base-files/lib/upgrade/platform.sh
index 58e7d83e4e..0223b72d71 100755
--- a/target/linux/mvebu/base-files/lib/upgrade/platform.sh
+++ b/target/linux/mvebu/base-files/lib/upgrade/platform.sh
@@ -28,6 +28,9 @@ platform_do_upgrade() {
 	marvell,armada8040-mcbin|solidrun,clearfog-base-a1|solidrun,clearfog-pro-a1)
 		platform_do_upgrade_sdcard "$1"
 		;;
+	methode,udpu)
+		platform_do_upgrade_uDPU "$1"
+		;;
 	*)
 		default_do_upgrade "$1"
 		;;
@@ -42,5 +45,8 @@ platform_copy_config() {
 	marvell,armada8040-mcbin|solidrun,clearfog-base-a1|solidrun,clearfog-pro-a1)
 		platform_copy_config_sdcard
 		;;
+	methode,udpu)
+		platform_copy_config_uDPU
+		;;
 	esac
 }
diff --git a/target/linux/mvebu/base-files/lib/upgrade/uDPU.sh b/target/linux/mvebu/base-files/lib/upgrade/uDPU.sh
new file mode 100644
index 0000000000..1e98f675f6
--- /dev/null
+++ b/target/linux/mvebu/base-files/lib/upgrade/uDPU.sh
@@ -0,0 +1,152 @@
+# uDPU uses combined ext4 and f2fs partitions.
+# partition layout:
+#	1. boot	(ext4)
+#	2. recovery  (ext4)
+#	3. rootfs (f2fs)
+#	4. misc (f2fs)
+
+# Check which device is available, depending on the board revision
+if [ -b "/dev/mmcblk1" ]; then
+	emmc_dev=/dev/mmcblk1
+elif [ -b "/dev/mmcblk0" ]; then
+	emmc_dev=/dev/mmcblk0
+else
+	echo "Cannot detect eMMC flash, aborting.."
+	exit 1
+fi
+
+part_prep() {
+	 if [ "$(grep $1 /proc/mounts)" ]; then
+		mounted_part="$(grep $1 /proc/mounts | awk '{print $2}' | head -1)"
+		umount $mounted_part
+		[ "$(grep -wo $mounted_part /proc/mounts)" ] && umount -l $mounted_part
+	fi
+}
+
+do_part_check() {
+	local emmc_parts="1 2 3 4"
+	local part_valid="1"
+
+	# Check if the block devices exist
+	for num in ${emmc_parts}; do
+		[[ ! -b ${emmc_dev}p${num} ]] && part_valid="0"
+	done
+
+	# If partitions are missing create a new partition table
+	if [ "$part_valid" != "1" ]; then
+		printf "Invalid partition table, creating a new one\n"
+		printf "o\nn\np\n1\n\n+256M\nn\np\n2\n\n+256M\nn\np\n3\n\n+1536M\nn\np\n\n\nw\n" | fdisk -W always $emmc_dev  > /dev/null 2>&1
+
+		# Format the /misc part right away as we will need it for the firmware
+		printf "Formating /misc partition, this make take a while..\n"
+		part_prep ${emmc_dev}p4
+		mkfs.f2fs -q -l misc ${emmc_dev}p4
+		[ $? -eq 0 ] && printf "/misc partition formated successfully\n" || printf "/misc partition formatting failed\n"
+
+		do_initial_setup
+	else
+		printf "Partition table looks ok\n"
+	fi
+}
+
+do_misc_prep() {
+	if [ ! "$(grep -wo /misc /proc/mounts)" ]; then
+		mkdir -p /misc
+		mount ${emmc_dev}p4 /misc
+
+		# If the mount fails, try to reformat partition
+		# Leaving possiblity for multiple iterations
+		if [ $? -ne 0 ]; then
+			printf "Error while mounting /misc, trying to reformat..\n"
+
+			format_count=0
+			while [ "$format_count" -lt "1" ]; do
+				part_prep ${emmc_dev}p4
+				mkfs.f2fs -q -l misc ${emmc_dev}p4
+				mount ${emmc_dev}p4 /misc
+				if [ $? -ne 0 ]; then
+					umount -l /misc
+					printf "Failed while mounting /misc\n"
+					format_count=$((format_count +1))
+				else
+					printf "Mounted /misc successfully\n"
+					break
+				fi
+			done
+		fi
+	fi
+}
+
+do_initial_setup() {
+	# Prepare /recovery parition
+	part_prep ${emmc_dev}p2
+	mkfs.ext4 -q ${emmc_dev}p2 | echo y &> /dev/null
+
+	# Prepare /boot partition
+	part_prep ${emmc_dev}p1
+	mkfs.ext4 -q ${emmc_dev}p1 | echo y &> /dev/null
+
+	# Prepare /root partition
+	printf "Formating /root partition, this may take a while..\n"
+	part_prep ${emmc_dev}p3
+	mkfs.f2fs -q -l rootfs ${emmc_dev}p3
+	[ $? -eq 0 ] && printf "/root partition reformated\n"
+}
+
+do_regular_upgrade() {
+	# Clean /boot partition - mfks.ext4 is not available in chroot
+	[ "$(grep -wo /boot /proc/mounts)" ] && umount /boot
+	mkdir -p /tmp/boot
+	mount ${emmc_dev}p1 /tmp/boot
+	rm -rf /tmp/boot/*
+
+	# Clean /root partition - mkfs.f2fs is not available in chroot
+	[ "$(grep -wo /dev/root /proc/mounts)" ] && umount /
+	mkdir -p /tmp/rootpart
+	mount ${emmc_dev}p3 /tmp/rootpart
+	rm -rf /tmp/rootpart/*
+}
+
+platform_do_upgrade_uDPU() {
+	# Prepare and extract firmware on /misc partition
+	do_misc_prep
+
+	[ -f "/misc/firmware" ] && rm -r /misc/firmware
+	mkdir -p /misc/firmware
+	tar xzf "$1" -C /misc/firmware/
+
+	do_regular_upgrade
+
+	printf "Updating /boot partition\n"
+	tar xzf /misc/firmware/boot.tgz -C /tmp/boot
+	[ $? -eq 0 ] && printf "/boot partition updated successfully\n" || printf "/boot partition update failed\n"
+	sync
+
+	printf "Updating /root partition\n"
+	tar xzf /misc/firmware/rootfs.tgz -C /tmp/rootpart
+	[ $? -eq 0 ] && printf "/root partition updated successfully\n" || printf "/root partition update failed\n"
+	sync
+
+	# Saving configuration files over sysupgrade
+	platform_copy_config_uDPU
+
+	# Remove tmp mounts
+	tmp_parts=$(grep "${emmc_dev}" /proc/mounts | awk '{print $2}')
+	for part in ${tmp_parts}; do
+		umount $part
+		# Force umount is necessary
+		[ "$(grep "${part}" /proc/mounts)" ] && umount -l $part
+	done
+
+	# Sysupgrade complains about /tmp and /dev, so we can detach them here
+	umount -l /tmp
+	umount -l /dev
+}
+
+platform_copy_config_uDPU() {
+	# Config is saved on the /misc partition and copied on the rootfs after the reboot
+	if [ -f "/tmp/sysupgrade.tgz" ]; then
+		cp -f /tmp/sysupgrade.tgz /misc
+		sync
+	fi
+}